Choose loading method:

SYSBOOT [4..0]signalsin the AM335x processor are used to select loading mode and order, they are read at power-up. Mode SYSBOOT [4..0] = b10011is installed on thismodule by pullup resistors 100K. To change the loading mode, you can pull up smaller denomination resistors (eg. 1K) to the desired value or use XBOOT jumper on the debug board. The table lists signalsconformity on the module, processor and development board:

SYSBOOT

Corresponding GPIO

X3 connector output number on the module

XBOOT on MTAX-MB-AM335x-v.2

SYSBOOT0

GPIO2_6

33

XBOOT5

SYSBOOT1

GPIO2_7

32

XBOOT4

SYSBOOT2

GPIO2_8

31

XBOOT3

SYSBOOT3

GPIO2_9

30

XBOOT2

SYSBOOT4

GPIO2_10

29

XBOOT1

Several loading modes:

SYSBOOT[4..0]

Loading order

notes

b10011

NAND-NANDI2C-MMC0-UART0

Factory installed regime for modules MTAX-SOM-AM335x

b10001

XIP-UART0-EMAC1-MMC0

Setjumper XBOOT4 (2-3) orbyacompoundthroughresistorX3: 32 and X3: 80

b00011

UART0-SPI0-XIP-MMC0

SetjumperXBOOT1 (2-3) orbyacompoundthroughresistorX3:29andX3:80

b10110

SPI0-MMC0-UART0-EMAC1

SetjumperXBOOT5 (2-3)andXBOOT3(1-2)

b10111

MMC0-SPI0-UART0-USB0

SetjumperXBOOT3 (2-3) orbyacompoundthroughresistorX3:31andX5:38

b00111

EMAC1-MMC0-XIP-NAND

SetjumperXBOOT1 (2-3) and XBOOT3(1-2)

b01011

USB0-NAND-SPI0-MMC0

SetjumperXBOOT 1 (2-3) and XBOOT2(1-2)

Connecting UART

To observe the loadingprocess of the processor module MTAX-SOM-AM335x, before toturn it on (power supply), you must connect the outputs of the UART0 module to a PC serial port through the corresponding transmitter (UART ↔ RS-232 or UART ↔ USB). Connection order of the contact sockets X1, according to UART0 of the module, indicated in the table below:

Pin No. Signal Name

Signal

Appointment

10

UART0_TXD

Transmitteroutput

11

UART0_RXD

Receiverinput

12

GND

GND

8

+3.3V

Power (given by module). Inference can be employed to arrange the power adapter (UART ↔ RS-232 or UART ↔ USB)